"You're a bit more low-key," she informs him. "Not exactly calmer. More self assured. You were before but now you're." She waves a hand. "More so."

Also a bit more murderous, she notes but doesn't say. It's not that she thought that killing people was impossible for him, just that he's got it more available as an option now. And has used it. Which is a little creepy, but she's rolling with it.